Guardian: This Sunday, on the eve of the UN climate summit in Paris, people in cities across the globe will fill the streets as they march against climate change. One city will be noticeably absent from the movement: the city that plays host to the summit. Security concerns following the recent attacks have led to protests in the French capital being banned. This effective silencing makes the need for a global voice more vital than ever. So, be inspired by our gallery of past climate marches and get ready...